stone retarder

例句：

1. 1. The engineer designed a stone retarder to slow down the machinery.
   工程师设计了一个减速器来减缓机器的速度。
2. 2.The stone retarder was crucial inmaintaining the smooth operation of the conveyorbelt.
   减速器在保持输送带平稳运行中起着至关重要的作用。
3. 3. Thestone retarder wasinstalled at the beginning of thetunnel to prevent any accidents during construction.
   减速器安装在隧道的入口处，以防止施工过程中的任何事故。